Usually, I find that being well-educated and/or well-traveled makes people more open/large-minded, tolerant, patient, non-racist, non-nationalistic, peaceful, etc., and that being poorly educated and/or traveled makes people the opposite of those things. People who, mentally or physically, never go far from home usually seem to be the ones who are passionately attached to one (and against all others) religion, ethnic or national identity, sports team, local dialect of a language, and so on. A common metaphor for such people in south and southeast Asian countries is “frogs in a well.”
Many times in my life, in myself and others, I have seen how inaccurate, incomplete, often negative views can be reinforced by brooding or brainwashing — by a person going into some kind of echo chamber (in their head, on the Internet, only spending time with similar people in the real world, etc.) for a long time and repeating certain thoughts or feelings over and over until they become more and more extreme. The same was apparently true in the Buddha’s time, about 2,600 years ago: “‘He insulted me, he hit me, he beat me, he robbed me’ — anger will never cease in those who dwell on such thoughts” (Dhammapada, 3).
But real people are small and complicated. Everyone finds themselves born into a certain body, family, country, etc., which can be hard to escape. Everyone has had many unique past experiences that informed them. No one can see or learn everything. The only way to understand the complexity of life or people is to get out of your comfort zone (either mentally or physically) and have strange, new, different experiences. Brooding or brainwashing in isolation usually only makes one’s views more xenophobic, unrealistic, inaccurate, and incomplete; having difficult, new conversations and experiences usually makes one’s views more connected, realistic, accurate, and complete.
Here is a nice Ted talk, which says pretty much the same thing:
In my experience, every large group, nation, etc. contains the full range of people, from terrible to wonderful. “They” are not all bad, and “we” are not all good. Please stop seeing the world in terms of simplistic categories, and start seeing the incredible complexity of life.